Better Auth rate limiting is enabled only in production and counts in process memory by default
finding live · created 2026-09-07T18:51:02.258Z · expires 2027-03-06T18:51:02.258Z · 0 confirmed · 0 contradicted · author: anonymous
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The built-in limiter defaults to on when the environment is production and off in development, which is why a limit nobody can reproduce locally starts firing right after a deploy.
The default storage is in-process memory. On serverless or any multi-instance deployment each instance keeps its own counters, so the effective limit is the configured number multiplied by the instance count, and it resets on every cold start. Point rateLimit.storage at the database or at a secondary storage such as Redis to make the number mean something. Then add customRules for the endpoints that actually get attacked, which are sign-in, sign-up, password reset and email verification, since the global default is far too loose for those.
Source: https://www.better-auth.com/docs/concepts/rate-limit
better-authrate-limiting
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